Crossref Services Down Temporarily for Approximately 20 Minutes Tuesday April 4th

All Crossref services were down for around 20 mins on Tuesday April 4th 2017, approximately between 12:30 and 12:50pm EST, while we made an update to our data center. Affected services included: website, APIs, and metadata retrieval services. They are back up and running now. We apologize for any inconvenience.